Figure 8.

(a) LSPR peak position as a function of bulk RI with pH 4.5 and 3.0 for one sampled series; (b) the error of the LSPR peak position by holding the reference spectrum constant at $R_{\lambda }\left(\mathrm{pH}4.5\right)$ for increasing bulk RI with pH 4.5 and 3.0.